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J Environ Anal Health Toxicol > Volume 27(2); 2024 > Article
Journal of Environmental Analysis, Health and Toxicology 2024;27(2):112-121.
DOI: https://doi.org/10.36278/jeaht.27.2.112    Published online June 30, 2024.
Reliability Evaluation for Mercury Stable Isotope Ratio Measurement by MC-ICP/MS
Seoyeong Choi1, Jaeseon Park2, Myungjin Kim2, Minseob Kim2, Jeeyoung Kim2, Jongwoo Choi3
1Department of Environmental Engineering,Ewha Womans University, Seoul 03760, Korea
2Environmental Measurement & Analysis Center, National Institute of Environmental Research, Incheon 22689, Korea
3Department of Civil and Environmental Engineering, Konkuk University, Seoul 05029, Korea
MC-ICP/MS 이용 수은 안정 동위원소비 측정의 신뢰성 평가
최서영1, 박재선2, 김명진2, 김민섭2, 김지영2, 최종우3
1이화여자대학교 환경공학과
2국립환경과학원 측정분석센터
3건국대학교 사회환경공학부
Correspondence:  Jongwoo Choi,
Email: cjw111@hanmail.net
Received: 23 May 2024   • Revised: 29 May 2024   • Accepted: 30 May 2024
Abstract
This study assessed the reliability of Mercury (Hg) stable isotope ratio measurements using MC-ICP/MS hyphenated with three different systems: wet plasma, dry plasma, and a cold vapor generator (CVG). Precision measurements using wet plasma improved with concentration, showing a range of 0.4 - 10.0% at 100 µg/L, with corresponding accuracy from 0.0 – 0.4%. By contrast, dry plasma demonstrated precision between 0.02 - 2.2% at 10 µg/L for 202/198Hg, with accuracy ranging from 1.2 - 1.4%. The CVG system, however, displayed significantly enhanced accuracy, from 0.2% for 199/198Hg to 0.9% for 204/198Hg at 0.1 µg/L. The study also incorporated a mass bias correction using a thallium (NIST 997 standard) internal spike, emphasizing the importance of maintaining a total Hg beam above 0.5 V to ensure measurement precision and accuracy. The findings suggest that the CVG method is most suitable for environmental samples with trace Hg concentrations, while both dry and wet plasma systems can serve effectively at higher concentrations (≥ 100 µg/L), given their analytical convenience and performance.
Key Words: Hg, isotope ratio, MC/ICP/MS, wet plasma, dry plasma, CVG
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